Keithley 195A
The Keithley 195A is a 5½-digit LED True-RMS, auto-ranging digital multimeter. It features a standard GPIB interface. Current and True RMS ranges are optional (Opt. 1950). If option 1950 is installed, two jumper wires (zero-ohm resistors), W102 and W103 are to be removed from the circuit.
Key Specifications
| Voltage (DC) | 20 mV to 1000 V full scale in decade ranges; >1 GΩ input resistance (10 MΩ in 20 V and above ranges) |
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| Voltage (AC) | 200 mV to 700 V full scale in decade ranges; 2 MΩ // 75 pF; 250 kHz; True RMS; Crest factor <3:1 |
| Current (DC) | 20 μA to 2 A full scale in decade ranges (Option 1950) |
| Current (AC) | 200 μA to 2 A full scale in decade ranges (Option 1950); True RMS; Crest factor <3:1 |
| Resistance | 20 Ω to 20 MΩ full scale in decade ranges, 2- or 4-terminal |
| Temperature | –200 °C to +630 °C using a PT-100 (DIN 43760) RTD sensor |
Pictures
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Front panel
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Rear panel
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Internal view, unit with Option 1950 board (bottom left), zero-ohm resistors W102 and W103 are lifted
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Internal view, unit with Option 1950 board (bottom left)
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Internal view, Option 1950 board flipped up
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Internal view of main board under option/shield
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Internal view towards the rear of the unit
